I had the chance to buy this cheap from a friend
My first PC was a PC10-III with dual floppydrives. I always wanted my first PC back and a month ago,I got this PC20-III (not the same config as mine back then but good and close enough).
I had to do some work and upgrades to it so I added a NEC V20 (modelnr is D70108C-10).
Checkit reports it as a V20 at 4,7MHz.
Using the speed.exe tool (I'm using version 1.2) that came with the original software, one should be able to change the speed to turbo and double (or with a keycombo).
Well....mine does nothing. I can run the command like speed -d but it seems nothing changes. Is it supposed to say something?
Checkit keeps reporting 4,7MHz.
Landmark System Speed Test 2.0 reports weird numbers. Version 6.0 hangs at 'calculating CPU speed'. When running Speed Test and doing the keycombo,sometimes the speed drops for a split second and then goes back to the one shown in my screenshot.
Installing the original 8088 seemed to change nothing.
Am I missing something here?

Thanks in advance...